Improve your running speed by understanding how shoulder flexor muscles drive arm movement, rotation, and coordination. Discover why your upper body plays a critical role in performance.

Improve your running speed by understanding how shoulder flexor muscles drive arm movement, rotation, and coordination. Discover why your upper body plays a critical role in performance.

Just How Important Are They? If you knew just how important your shoulder flexor muscles were for speed, then you’d probably invest a lot more time in training them. This is because your shoulder flexor muscles create much needed thrust to go along with the leg pushing off the ground helping you to run your […]